package com.example.demo.task;

import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author yuwc
 * @description 配置线程池
 * @data 2019/5/17 0017下午 3:36
 */
@EnableAsync
public class ThreadPoolTaskConfig {
     /**核心线程数（默认线程数）*/
    private static final int corePoolSize = 10;
    /** 最大线程数*/
    private static final int maxPoolSize = 100;
    /**允许线程空闲时间（单位：默认为秒）*/
    private static final int keepAliveTime = 10;
    /**缓冲队列数*/
    private static final int queueCapacity = 200;
    /**线程池名前缀*/
    private static final String threadNamePrefix = "Async-Service-";
    /**bean的名称，默认为首字母小写的方法名*/
    @Bean("taskExecutor")
    public ThreadPoolTaskExecutor taskExecutor(){
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveTime);
        executor.setThreadNamePrefix(threadNamePrefix);

        // 线程池对拒绝任务的处理策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 初始化
        executor.initialize();
        return executor;
    }
}
